Railway Current Return Device Dust Isolation
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Solution Overview
Problem
Current return devices in railway vehicles face issues with wear and dust accumulation, leading to poor electrical contact and increased maintenance time due to complex construction and vulnerability to shocks and vibrations, resulting in prolonged vehicle immobilization.
Innovation Solution
A simplified current return device design with a support cavity housing the contact disc and a conductive connection piece forming a closed enclosure with a double baffle system for dust retention, eliminating the need for stabilizers and reducing maintenance time by allowing easier disassembly and replacement of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the contact disc is made protruding to facilitate cleaning access, then cleaning ease is improved, but stability and resistance to shocks and vibrations deteriorates
Solution Approach 1:
The device is divided into modular components: the contact disc can be independently removed from the bogie through the front access path, separating the cleaning/maintenance operation from the structural mounting. This allows the disc to be accessed for cleaning without compromising its mounted stability, as it can be easily detached and reattached through the segmented access path.
Solution Approach 2:
The contact disc is extracted as a removable component that can be taken out through the front access path of the bogie. This extraction capability allows maintenance personnel to access and clean the disc surface without dismantling the entire current return device, improving cleaning ease while maintaining structural integrity when installed.
2Object-generated harmful factors
If the cavity is separated into two parts with a seal to contain wear dust, then dust retention is improved, but device complexity and maintenance time increases
Solution Approach 1:
The wear dust containment function is extracted and concentrated into the single closed enclosure cavity. Instead of separating the cavity into multiple parts with seals, the entire brush holder assembly with its integrated cavity serves as the containment chamber, simplifying the structure while maintaining dust retention capability.
Solution Approach 2:
The closed enclosure acts as a flexible containment shell that traps wear dust generated by the brush-contact disc friction. The enclosure's closed structure prevents dust escape without requiring complex internal segmentation, using the shell itself as the containment mechanism.
3Reliability
If stabilizers are added to improve resistance to shocks and vibrations, then stability is improved, but device complexity and maintenance time increases
Solution Approach 1:
The stabilizing function is merged into the existing support structure and mounting mechanism of the contact disc. The support, which naturally provides structural stability, is designed to inherently resist shocks and vibrations without requiring separate stabilizer components. This integration maintains reliability while minimizing device complexity.
Solution Approach 2:
The support structure serves multiple functions: it holds the contact disc in position, provides structural stability against shocks and vibrations, and enables the disc to be accessed through the front path. This multi-functionality eliminates the need for dedicated stabilizer components, reducing overall device complexity.
4Reliability
If regular cleaning of the cavity is performed to maintain electrical contact, then contact quality is improved, but maintenance time and vehicle immobilization increases
Solution Approach 1:
The contact disc cleaning operation is extracted and made accessible through the front access path of the bogie. Maintenance personnel can remove and clean the disc without dismantling the entire current return device or enclosing structures, reducing maintenance time from over 16 hours to approximately 1 hour while maintaining electrical contact quality.
Solution Approach 2:
The contact disc is designed to be pre-positioned and easily accessible through the front path, allowing maintenance personnel to perform cleaning operations quickly without requiring preliminary dismantling of complex structures. The disc's removable design enables preliminary preparation for rapid maintenance intervention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances stability and resistance to shocks and vibrations, reduces maintenance time from over 16 hours to approximately 1 hour, and ensures better electrical contact by isolating wear dust from the brush-disc interface, improving the overall efficiency and economic viability of the current return system.
Implementation Method 1
the brush, driven by the wheel and rubs against the front surface of the contact disc
Implementation Method 2
at least one contact disc comprising at least one conductive material, at least one brush comprising at least one conductive material, in contact with said contact disc
Data Source
Figure 1
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AI summary
The device has a contact segment (13), and a brush (15) including conducting materials, where the brush is provided in contact with the contact segment. A set of supports (12a, 12b) is provided with an insulating material. The supports are connected to a fixing unit (9) or metal rod, where the supports are designed to support the contact segment. A connection conducting part (16) is arranged to connect the brush to a front face of a wheel (3). The brush is optionally connected jointly to a brush holder (14). The supports include a cavity to place the contact segment. Independent claims are also included for the following: (1) a method for disassembling an electric current return device (2) a method for assembly of electric current return device.